Unknown
CVE-2020-15811
CVE-2020-15811
Description
An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.
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CVSS V3 Severity and Metrics
General Information
Vendors
- canonical,
- debian,
- fedoraproject,
- opensuse,
- squid-cache
Products
- debian linux 10.0,
- debian linux 9.0,
- fedora 31,
- fedora 32,
- fedora 33,
- leap 15.1,
- leap 15.2,
- squid,
- ubuntu linux 16.04,
- ubuntu linux 18.04,
- ubuntu linux 20.04
References
Advisory
